Re: [Crash-utility] crash doesn't decode regs with 7.1.5 (32-bit MIPS)
----- Original Message -----
Hi,
I am facing issues with crash 7.1.5 for little endian mips CPU. Crash
is not able to decode the registers. But except registers all other
information is good. I tried to look at the notes section in the core
but doesn't seem anything wrong there. If I trace the vmcore with mips
gdb I can get the correct stack trace and register info.
crash> i r
The program has no registers now.
gdb: gdb request failed: i r
crash> bt
PID: 267 TASK: 808f66d0 CPU: 0 COMMAND: "sh"
Hi Sagar,
The "i r" gdb command is not supported by the gdb embedded in the crash
utility because it is invoked as "gdb vmlinux", and therefore it has no
clue about any task or register set in a vmcore.
I don't know why the "bt" command is not working. MIPS support was wholly
written (and supported) by Rabin Vincent. I've modified the subject line
to indicate such, as well as cc'ing him directly.
Dave
For the same vmcore, on gdb:
(gdb) i r
zero at v0 v1 a0 a1 a2 a3
R0 00000000 004b376a 00000002 00000001 000024b0 0000000a ffffffff 00000002
t0 t1 t2 t3 t4 t5 t6 t7
R8 808f1180 00000000 00000001 77ab8000 7fd53050 004b4580 00000000 00000000
s0 s1 s2 s3 s4 s5 s6 s7
R16 00000002 808f0b80 808f1180 fffffff2 80d97f10 808f0b8c 00000030 00480000
t8 t9 k0 k1 gp sp s8 ra
R24 00000002 803b05bc 0000000a 81005890 80d94000 80d97e18 00000020 803b05e0
sr lo hi bad cause pc
50808000 1100fc03 00000000 00000002 803b05e0 00000000
(gdb) bt
#0 0x00000000 in ?? ()
#1 0x803b05e0 in pcieport_sysfs_store (kobj=<optimized out>,
attr=<optimized out>, data=<optimized out>, len=<optimized out>) at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/drivers/cisco/pcieport/sysfs.c:59
#2 0x8021c6bc in kernfs_fop_write (file=<optimized out>,
user_buf=<optimized out>, count=<optimized out>, ppos=0x80d97f10) at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/fs/kernfs/file.c:312
#3 0x801c9020 in __vfs_write (file=0x24b0, p=<optimized out>,
count=<optimized out>, pos=<optimized out>) at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/fs/read_write.c:489
#4 0x801c9eac in vfs_write (file=0x83b187c0, buf=0xa <Address 0xa out
of bounds>, count=<optimized out>, pos=0x80d97f10) at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/fs/read_write.c:538
#5 0x801ca0dc in SYSC_write (count=<optimized out>, buf=<optimized
out>, fd=<optimized out>) at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/fs/read_write.c:585
#6 SyS_write (fd=<optimized out>, buf=<optimized out>,
count=<optimized out>) at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/fs/read_write.c:578
#7 0x8010e1dc in syscall_common () at
/build/sborikar/bodegadev/bodega-dev/mcpu/firmware/linux-4.4/arch/mips/kernel/scall32-o32.S:102
Any idea?
Thanks
Sagar
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